Denim boot upper with button front



FIG. 1 is a front, left side perspective view of a denim boot with button front, showing my new design;

FIG. 2 is a rear, right side perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a front perspective showing the upper portion partially pulled open to expose the buttons. 

I claim the ornamental design for denim boot upper with button front, as shown. 